Test error propagation

[kennykerr]

As I work on splitting the core modules out as separate crates, I noticed we don't have a specific test to ensure error propagation does not regress.

[riverar]

Another thing I noticed is when we call message(), the call to GetErrorDetails/GetDescription/etc. may result in a message that includes a pesky line break.

This results in undesirable side effects when printing these messages, e.g.:

Error: Error { code: 0x8007007E, message: The specified module could not be found.
 }

Separate PR is in order to detect/strip these.

[kennykerr]

@riverar Yep, that's something that I trimmed automatically in cppwinrt - I'll do the same for Rust.